https://en.wikipedia.org/wiki/Superellipse

Code: Select all

```
Const scr_x = 800 ' screen 800 x 800
Const scr_y = 600
Const m_x = scr_x \ 2 ' middle of screen
Const m_y = scr_y \ 2
Sub superellipse(a As Long, b As Long, n As Double)
ReDim As Long y(0 To a)
Dim As Long x
y(0) = b ' value for x = 0
y(a) = 0 ' value for x = a
'(0,0) is in upper left corner
PSet (m_x, m_y - y(0)) ' set starting point
For x = 1 To a-1
y(x) = Int( Exp( Log(1 - ((x / a) ^ n)) / n ) * b )
Line - ((m_x + x), (m_y - y(x)))
Next
For x = a To 0 Step -1
Line - ((m_x + x), (m_y + y(x)))
Next
For x = 0 To a
Line - ((m_x - x), (m_y + y(x)))
Next
For x = a To 0 Step -1
Line - ((m_x - x), (m_y - y(x)))
Next
End Sub
' ------=< MAIN >=------
ScreenRes scr_x, scr_y, 32
Dim As Long a = 200
Dim As Long b = 150
Dim As Double n = 2.5
superellipse(a, b, n)
' empty keyboard buffer
While Inkey <> "" : Wend
Print : Print "Press any key to end program"
Sleep
End
```

Code: Select all

```
screenres 800, 600, 32
Const screenwidth = 800
Const screenheight = 600
dim as integer xc, yc
dim as double a, b, m, n
Const pi = 3.1459265
xc = screenwidth / 2
yc = screenheight / 2
a = 200
b = 100
m = 2.5
n = 2.5
for i as double = -pi to pi step 0.01
dim as double x = a * abs(cos(i)) ^ (2 / m) * sgn(cos(i))
dim as double y = b * abs(sin(i)) ^ (2 / n) * sgn(sin(i))
pset (xc + x, yc + y), rgb(255, 255, 255)
next
sleep
```